I have read this thread and just thought I would throw in my 2 cents.
I have been where you are. I feel your pain and confusion. My RAH has acted just like I should accept what he was doing and has even told me he continued to use because of me...seeing how much he has hurt me, blah blah blah. I know you are hurting, he has given you glimps of what he can be or what life can be. Those are reasons why we stay and try to help. Why some of us stay until we hit rock bottom ourselves. Trust me, I was no quitter until my mind broke. Yet, I am still here with him for one reason. He is trying to recover, dealing with his demons, but that is today. I cannot future trip, or my mind will break again.
LMN, let your higher power drive this one and steer you. Lay it down at his feet, because if it is meant to be, it will. You don't need to sort out your feelings today. Deal with what is in front of you today, which sounds like someone, the addict, not ready to deal with their demons, so take care of YOU.